<template>
  <div class="wrapper" ref="wrapper">
    <div class="content">
      <slot></slot>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
export default {
  name: 'Scroll',
  props: {
    probeType: {
      type: Number,
      default: 0
    },
    pullUpLoad: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      scroll:null
    }
  },
  // 生命周期 - 创建完成（访问当前this实例）
  created() {
// this.scroll.refresh();
  },
  // 生命周期 - 挂载完成（访问DOM元素）
  mounted() {
    // 创建BScroll对象
    this.scroll = new BScroll(this.$refs.wrapper, {
      click:true,
      probeType: this.probeType,
      // disableTouch: false,
      pullUpLoad: this.pullUpLoad
    })

    // 监听滚动位置
    if(this.probeType === 2 || this.probeType === 3 ){
      this.scroll.on('scroll', (position) => {
        this.$emit('scroll',position)
      })
    }

    //监听滚动到底部
    if(this.pullUpLoad) {
      this.scroll.on('pullingUp',() => {
        console.log('监听滚动到底部')
        this.$emit('pullingUp')
      })
    }
  },
  methods: {
    //回到顶部：
     scrollTo(x,y,time=300){
      this.scroll && this.scroll.scrollTo(x, y, time)
    },
    refresh() { 
      this.scroll && this.scroll.refresh()
    },
    finishPullUp() {
      this.scroll && this.scroll.finishPullUp()
    },
    getScrollY(){ // 获取scrollY位置
      return this.scroll ? this.scroll.y : 0
    }

  }
}
</script>
<style scoped>
/* @import url(); 引入css类 */
</style>
